Hi Joerg,

Joerg Schilling wrote on Sat, Oct 12 2002:

>The fact that Linux does not use DMA with ATAPI has ben reported by
>may people!

For example in the Linux Kernel Mailing List, and one would assume,
that those guys know what's going on.

>In addition, it may be that Linux does not report the load correctly
>when doing PIO to the drive.

This (sadly) is another issue, when using e.g. "top", one should
*not* look at the CPU-consumption of cdrecord, but have a look at
the "idle" time. You will find, that cdrecord e.g. uses 5% resources,
the other tasks maybe another 5%, but that idle-time (should be around
90% in this example) is only 10% or less.

Meaning: the ressources shown in "top" do not add up when the kernel
falls back to PIO mode. It's quite easy to get confused about the real
ressources-consumption, when just watching the processes and/or
system/user times. Again: the idle time is important.

Kind regards   Frederick


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